问题
选择题
Stand over there____you'll be able to see it better. [ ]
A. or
B. while
C. but
D. and
答案
答案：D
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Stand over there____you'll be able to see it better. [ ]
A. or
B. while
C. but
D. and
答案：D
在x=e处为无穷间断点，在x=1处为可去间断点，则常数a，b分别为______．